u/Admirable-Cod2306

Hi, I need some advice. I have a very old Steam account that I recently returned to by buying my first game for it. However, one day I woke up and couldn't log in. I didn't have Steam Guard enabled, and I no longer have access to the email address associated with the account—it wasn't created by me, but by my father, who unfortunately no longer has that email account. What can I do?